Cod sursa(job #2460658)

Utilizator Daniel237Jugariu Daniel Daniel237 Data 24 septembrie 2019 09:05:05
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.83 kb
#include <bits/stdc++.h>
using namespace std;
fstream f("bfs.in");
ofstream g("bfs.out");
vector <int>vecini[100005];
queue <int> q;
int n,m,s,dist[100005];
void BFS();
int main()
{
    f>>n>>m>>s;
    for(int i=1;i<=m;i++)
    {
        int a,b;
        f>>a>>b;
        vecini[a].push_back(b);
    }
    for(int i=1;i<=n;i++)
        dist[i]=-1;
    dist[s]=0;
    q.push(s);
    BFS();
    for(int i=1;i<=n;i++)
        g<<dist[i]<<' ';
    g.close();
    return 0;
}
void BFS()
{
    int nc,nu;
    while(!q.empty())
    {
        nc=q.front();
        q.pop();
        for(unsigned int i=0;i<vecini[nc].size();i++)
        {
            nu=vecini[nc][i];
            if(dist[nu]==-1)
            {
                q.push(nu);
                dist[nu]=dist[nc]+1;
            }
        }
    }
}